Maryland officials have set the stage for an appeal to the Supreme Court to revive their legal right to collect DNA samples from individuals who have been arrested, but not yet convicted of a crime — if the state’s highest court cannot be persuaded to reconsider its partial ban on that procedure. The issue has divided lower federal and state courts, and the case of King v. Maryland would appear to pose the issue in a simple and direct way — a rape conviction would fall, and getting a guilty verdict at a new trial could be in considerable doubt.